XML 43 R35.htm IDEA: XBRL DOCUMENT v3.20.1
Commitments and Contingencies - Textual (Details)
€ in Thousands
 12 Months Ended
Oct. 25, 2019
EUR (€)
Jun. 28, 2019
EUR (€)
Feb. 01, 2019
USD ($)
Dec. 31, 2019
USD ($)
ft²
Dec. 31, 2018
USD ($)
ft²
VTT Technical Research Centre of Finland Ltd [Member]          
Long-term Purchase Commitment [Line Items]          
Commitment to pay   € 2,520      
Commitment development period   3 years      
Commitment success bonus award   € 450      
Commitment to pay, expanded € 690        
Commitment to pay, expanded, period 1 year 6 months        
Commitments, right to terminate contract notice period   90 days      
Jupiter, Florida Headquarters Lease          
Long-term Purchase Commitment [Line Items]          
Area of building rented | ft²       4,900  
Monthly rental rate | $       $ 9,700  
Netherlands Office Lease          
Long-term Purchase Commitment [Line Items]          
Area of building rented | ft²         258
Rent expense | $     $ 4,000   $ 4,700
Term of contract     1 year